I simply can't understand why is it that the Month is in some different language. My browser and my system is based on UK English but this is really driving me crasy because I tend to look at date/time whenever I post and this doesn't make sense.

Just like Latin script is used for a multitude of languages from Latin through English, Spanish, German, French, etc., Cyrillic characters are used in a variety of languages, from Russian through Ukrainian to Bulgarian.

All I did is point out that груд means piles in Russian. There was no implication in my post that such a meaning will cover the word in other languages that use Cyrillic. December in Russian is декабрь.